Bolt making machine



Nov. 12, 1935. E. R. FROST BOLT MAKING MACHINE Filed March 25 1935 5 Sheets-Sheet l ZSnnentor (I ttorneg fine; if P/eosz Nov. 12, 1935.

E. R. FROST BOLT MAKING mcrmm s Sheets-Shet 2 Filed March 25, 1933 I l I l l, L

g m ww I L I I l |I Snventor .5741?! Fveasr (Ittorneg Nov. 12, 1935. FROST 2,020,659

BOLT MAKING mcnmr:

Filed llarch 25, 1933 5 sheds-sheet 3 3nventdr W /4%;. Y (Ittorneg Nov. 12, 1935. E. R. FROST BOLT MAKING MACHINE Filed March 25, 1953 5 Sheets-Sheet 4 rlllll I 54:4 Fear ttorneg Nov. 12, 1935. E FROST BOLT MAKING mcnnm 5 Sheets-Sheet 5 Filed March 25, 1935 Zinvmtor 5, B FfOSTT By W Gttorneg Patented Nov. 12, 1935 UNITED STATES- BOLT MAKING momma Earl R. Frost, Tiflin, Ohio, assignor to The National Machinery Company,- Tiiiin, Ohio, a

corporation of Ohio Application March 25, 1933, Serial No. 662,719

31 Claims.

This invention relates to bolt making machinery, and particularly to improvements in headers provided with screw-thread rolling mechanism, the improvements being illustrated in the accompanying drawings as embodied in a bolt making machine of the type disclosed in my copending application Serial No. 639,054, filed October 22, 1932. It will be understood, however, that such illustrative embodiment is not to be construed as o a limitation since the improved mechanism may be used in whole or in part with other heading or bolt making machines.

The principal objects of the invention are to efiect an improved combination of the header 5 slide of a bolt making machine or header, a stationary thread-roiling die, a relatively movable die, and means for reciprocating the latter; to provide improved deliverymechanism for the thread-rolling dies of bolt-making machines go whereby, among other advantages, the construction is simplified, the action is rendered more positive and capable of higher speeds, and adjustments for different shanks or thread lengths as well as shank diameters are facilitated; to

5 provide for a substantially straight-line pull or drive of a movable die in a thread-rolling direction and thereby avoid lateral stresses and strains on the die and obtain more complete utilization of the driving component, and to improve the 50 general construction of the die-reciprocating mechanism particularly in machines where such mechanism is associated with a relatively movable header slide or other reciprocating member of a bolt making or forging machine; to provide :5 an improved type of adjustable mounting for the stationary die which insures true alinement thereof during the thread-rolling operation and a resultant accurately formed thread on the bolt shanks; and to generally improve the threadto rolling mechanism of bolt making machinery.

The foregoing and other objects and advantages will become apparent in view of the following description taken in conjunction with the drawings, wherein:-

45 Figure 1 is a top plan view of the rear extremity of a bolt making or forging machine showing the present improved thread-rolling mechanism operatively associated therewith;

Figure 2, is a view in side elevation of Figure 1; Figure 3 is a rear end elevation partly in section and with the die-reciprocating toggle mechanism removed to more clearly show the mounting of the thread-rolling dies and coacting parts;

5 Figure 4 is an enlarged detail view, in broken side elevation, showing a pusher assembly and parts for mounting same;

Figure 5 is an enlarged fragmentary view taken substantially on the line-.5.-5, Figure 1, particularly showing the delivery mechanism for the l bolt blanks and coacting parts and method of mounting same; and Figures 5a and 5b are'detail fragmentary views bf parts of Figure 5, Figure 5a being taken substantially on the line Baa-5a, i ur a Figure 6 is a diagrammatic representation of the driving action of the toggle mechanism for the reciprocating die;

Figure 7 is an enlarged detail view in side elevation of an adjustable wedge assembly for the is stationary die; Figure 7a. is an'end elevation of Figure 7; and Figure 7b is a fragmentary sectional view through the adjusting wedges and adjacent die block and frame structure to illustrate the application of said wedge;

Figure 8 is an enlarged fragmentary sectional view of parts of the pusher mechanism, and Figure 8a is a sectional plan view of Fig. 8;

Figures 9 and 9a are views in plan and side elevation of a blank-supporting and alining device together with fragments of the thread-rolling dies and other adjacent parts.

Referring in detail to the drawings and first to Figs. 1, 2 and 3, the reference numeral 5 designates the bed frame and 6 the tail slide of a bolt making machine, which machine is preferably of the type disclosed in my copending application above noted but which may be any other header or upsetting machine for making bolt blanks from wire or rod stock. In the machine .of my prior 85 application, one of the thread-cutting dies is mounted to move with the tail slide of the machine while the other die is mounted to move in a direction opposite to the first-named die during the thread-rolling operation. The fact that both dies move complicates the blank-feeding operation and the construction of the feeding mechanism in general.

A feature of the present invention resides in the provision of means whereby one of the dies maybe stationarily mounted in the bed. frame of the machine while the other die is reciprocated by the tail slide with ample length of stroke to efficiently perform the thread-rolling operation and having any desired ratio to the length of stroke of the tail slide, the pull or drive on the i die being in a substantially straight line.

The numeral 1 designates the stationary die, which is firmly and adjustably anchored, in a manner to be described, in the rear extremity oi the bed frame 5, and 8 the movable die, which is firmly anchored in a supporting or slide block 9 movably mounted in a recess formed in the adjacent side of the tail slide 6 and held against displacement by a' retainer cap or gib in having side flanges which engage at one side in 9. iongitudinal groove ll formed in the slide and at the opposite side over the slide block 9. Between the bottom of the block 9 and the tail slide 6, I

preferably position a wear liner i 2, (note Fig. 3) and to take the side thrust exerted during the thread-rolling operation while the block 9 is moving relatively to the slide, I provide bearings l3, and between the bearings and slide a liner I 4 is positioned. The opposite side of the slide 6 is also recessed to receive a bearing and liner assembly comprising bearings Ba and side liners Ha, Nb and a wedge member 15 which latter member prevents any tendency towards vertical displacement of the assembly when taking the relatively great side thrust during the thread rolling'operation. Bearings 13b are also provided between the slide 6 and a slide gib, later referred to Practical experience with machines of the present type has demonstrated that side thrust bear- .ings form an important part of the assembly,

since with the conventional type of slide bearing the driving mechanism is placed under considerable strain and has a tendency to bind during the thread rolling operation. Furthermore, by

using bearings a more snug fit may be had for the header slide with less friction and chances of play or misalinement of the moving parts developing due to the side thrust attending the thread rolling operation.

The bearings l3b also serve to preload the bearings l3 and 1341 or are so fitted or dimensioned as to compensate for spring or play of the slide 6 during the thread rollingoperation, and thereby prevent lateral inward springing movement of the slide when the threaded bolt leaves the dies and possible indenting or disfiguring of the thread.

Reciprocation of the die 8 is effected through the medium of the toggle mechanism, particularly shown in Fig. 1. This mechanism in its preferred form comprises a-lever l6 which is piv- .otally connected at one extremity to a link IT,

in turn pivotally anchored to the bed frame 5, and at its opposite extremity said lever I6 is pivotally connected to a link IS, in turn pivotally connected to the rear end of the die'carrying block 9. At an intermediate point, the lever I6 is fulcrumed to a boss i9 forming an extension of the slide 6.

In operation, when the tail slide 6 is reciprocated in the bed frame 5 to perform the heading operation, the die 8 and block 9 will in turn be reciprocated through the medium of the toggle mechanism just described, the pull on said block being always exerted in a substantially straight line as will be noted upon referring to the diagrammatlc representation in Figure 6. In this figure the pivotal connections of the link I! are indicated at Fla and Nb, the pivotal connections of the link 18 at I81; and I81), and the fulcrum connection of the lever it at iBa. This straight line pull is highly desirable inasmuch as lateral pulling stresses or strains are avoided as well as any tendency towards misalinement of the movable die during the thread-rolling operation.

The die 1 is provided with means whereby it may be adjusted both vertically and laterally, the means for effecting lateral adjustment being so Referring particularly-to Figures 1, 3 and 7, 20

designates a die block, 2| a slide gib, 22 a bottom adjusting wedge, 23 a side adjusting wedge, and 23' a tilting wedge adapted to be superposed on and, in a sense, he mated with the wedge 23. The wedges 23 and 23 when mated form therebetween 10 a slot 23a, and said. wedges are adapted to be inserted between the block 20 and an upright or boss portion 26 formed integral with the bed frame 5, while the wedge 22 is formed with a like slot 22a and is inserted between the gib 2| and block 15 20, the coacting inclined surfaces in contact with each of said wedges being reversely tapered longitudinally to provide true alinement of the block 20 and die-I. 'The faces of the side wedges are preferably given a convex contour in transgo verse section and mate with concave surfaces in the die holder as shown more clearly in Figure lb at 20a. This concavo-convex formation need be but slight to facilitate the desired adjustment hereinafter described. The die block 20, wedge 1| 22 and slide gib are anchored to the bed frame 5 by bolts 24 which pass through slot 22a formed in the wedge 22, and said block 20 is also anchored to the boss portion 26 of said frame by bolts 25 which pass through a slot 23a formed between so the complementary wedges 23 and 23'. The wedge 22 is formed with an end lug or bracket portion 22b having a threaded bore therein, and said wedge is adjustably anchored to the upright 26 by means of a threaded member or bolt 22c 1| which passes through said bore. The wedge 23 is also formed with an end lug or bracket portion 23b having two threaded bores therein, and the wedge 23 has its squared end adjustably anchored to the lug 23b by means of a threaded 40 adjusting member or bolt 220, the assembly comprising wedges 23, 23' and the adjusting bolt 220 being adjustably anchored to said upright 26 by means of a threaded member or bolt 21d, note particularly Figures 1 and 2. Suitable lock nuts 45 or analogous means may be provided for the adjusting members 22c, 23c, and 23d.

By loosening the bolts 24 and adjusting the threaded member 220 the wedge 22 may be ad 7 vanced or retracted to thereby raise and lower 5 the die block 20 and die 1. By loosening bolt 25 and adjusting the threaded member 23d, the said block and die may be adjusted laterally inwardly and outwardly, the-wedge 23' being held neutral or moved therewith, depending upon wheth- 55 er or not it is desired to adjust the die to obtain a desired inclination. In regard to this latter adjustment, since the shanks of the bolts which are to be threaded seldom extend the full width of the die, and in many instances extend for only a 0 portion of said width, as for example in Figure 5, the lateral thrust imposed on the die I during the thread rolling operation will have a tendency to rock or tilt the die, thereby throwing it out of alinement and forming a tapered thread. To 5 overcome this disadvantage, the separate adjusting wedge member 23 is provided in conjunction with the wedge 23. This wedge 23' contacts the upper outer side surface of the die block 20 and may be adjusted to initiallyset the latter at a 7 slight inward incline so that when the side thrust comes on, the die will be moved back or give slightly and assume accurate vertical alinement. This outward movement or give" under side thrust pressure is obviously very slight and the 7 adjustment by means of wedge 23' accordingly need be just sufficient to compensate for such movement. Another advantage of this adjustment is thatupon repeated re-grinding of the thread cutting dies, they sometimes tend to assume a convex shape with respect to their longitudinal axes or central portions, and this convexity can be compensated for by initially setting the block and die so that the upper working surface of the latter is in true vertical alinement with the corresponding surface of the reciprocating die, or at a slight inward incline as above indicated. The convex contour of the side adjusting wedges is provided to facilitate this tilting adjustment.

A further feature or features of advantage and novelty in the-present invention is the blankfeeding mechanism for the thread-rolling dies. Referring first to the detail showing in Figure 5, in conjunction with the main figures of the the drawings, 21 indicates a feed chute or trackway for the headed bolt blanks which comprises a pair of'rails or tracks rigidly connected at an intermediate point by a bracket 28 and at their upper ends by a bracket 29. Above the trackway or chute 21 is a steadying guide or finger 21a which is adapted to contact with the heads of the blanks B should the latter cant or become misalined as they approach the end of the chute 21. The finger 21a is adjustably secured to the bracket 28 as at 21b so that its angle of inclina supported by the pedestal 3i and adjustablyfixed on this shaft is an oscillatable transfer finger 33 having an upturned blank-carrying toe 33a, note particularly Figure 5b.

The lower end of the shaft 32 has secured thereon a roller bracket 3l in which is rotatably mounted a roller 35. A compression spring 36 is positioned in a boss or lug 31 formed on the lower extremity of the pedestal 3i and contacts the roller bracket ill, to thereby normally urge the transfer finger 33 to its delivery position with respect to the thread-rolling dies. A contact boss 38 is provided on the bracket 28 and contacts with a like boss 39 formed on the rear portion of the transfer finger 33, to insure correct positioning of said finger with respect to the chute 21.

A return cam lii is provided on the side of the tail slide 6, note particularly Figure 1, and this cam is adapted to contact the roller 35 and return the toe 33a of the transfer finger 33 to its receiving position with respect to the end of the delivery chute 21. The feature of having the transfer movement of the finger 33 under impositive actuation and its return movement positive is desirable, since it insures against breakage should the machine jam. It will be seen that when the slide 6 is reciprocated, the transfer finger I3 is oscillated alternately between a position to receive a bolt blank from the delivery end of the chute 21 and to a position which suspends the blank adjacent the opposed ends of the dies 'Iandlreadytobereceivedontheendsof pusher fingers, to be described, and then pushed into thread-rolling position between said dies.

A feature of importance is the control of the threaded-shank-length of the blank by simply adjusting the chute and transfer finger assembly 5 relatively to the thread-rolling dies. Thus if it is desired to shorten the threaded portion of the shanks, it is only necessary to adjust the assembly upwardly, so that the blank will be raised with respect to the dies when it is pushed between 10 the latter. Another feature is the fact that the entire assembly is carried by the pedestal 3i as a unit which may be readily removed and replaced without disturbing the parts of the unit. a The pusher preferably consists of upper and )5 lower fingers ll and lla which may be adjusted to vary the width or effective end-contact face of the pusher. The lower finger as shown is secured to the outwardly projecting portion lie of a pusher slide l2, note Figure 1, and has fixed 20 therein pins l! which supportthe upper finger ll, the latter being secured in adjusted position relatively to finger li a by a clamp bolt or analogous-means ll. The fact that the pusher may be adjusted to vary its effective contact face as is of advantage, since this provides an even propelling action for any length of bolt shank and avoids "cocking of the blank and possible misalinement when the latter is pushed between the faces of the opposing dies. The fact that 30 finger -li can be adjusted without disturbing finger lla obviates the required clearance space in the bed frame under the conventional unitary or integral type of pusher finger, which space is necessary for downward adjustment of the finger. '35 This adjustment also provides accurate alinement of the end of the pusher with respect to the blank head in accordance with varying ad-' justments of the transfer finger, since it is desirable that the blank heads rest squarely on top 40 of the pusher when the latter engages the shank.

The upper finger li may be, and as here shown is, provided at its blank-receiving and engaging end with a relatively thin projection or lip lib which together with the end of the said finger 45 defines a recess, as at lie, in which the shank engages with the head of the blank B resting on the end of the finger and said projection lib, note particularly Fig. 5b. I

The finger li passes behind and adjacent the 50 bracket 3i which supports the chute 21 and the transfer finger 33, as seen in Fig. 5. The upper edge of the finger ll is arranged to contact the under side of the boss 39' on the finger 33, as shown in Fig. 5, so as to limit adjustment of the 55 finger li upwardly with respect to the transfer finger 33. By reason of this arrangement the chute 21 can first be adjusted to deliver a blank from its end at the desired height. Thereupon, the transfer finger 33 can be moved upwardly so until the boss 38 engages the boss 38, at which point the finger 33 may be fixed to the shaft 32, leaving only 'sufllcient clearance between the bosses II and I! to prevent binding. The pusher finger li may then be adjusted upwardly in the 55 same way until this finger contacts the edge on the boss 30. All of the parts are then properly alined.

Figs. 9 and show a blank-supporting and alining device which may be, and preferably is 70 and to .this boss there is adjustably secured a blank-receiving and supporting device 4|e provided with a relatively long finger 4|! and a short finger 4 g which define an arcuate slot into which the blank 13 is advanced by the injector 4|, 4|a .wlth its head ridingon and guided by the fingers 4|f, 4|g. An aliriing abutment plate 4|h is positioned betweenthe securing wedge and the end of the die 8 and projects at a slight angle outwardly so that the shank of the blank will abut thereagainst and be alined vertically with respect to the dies. end of the pusherfinger 4| may be dispensed with.

In operation, as each blank B moves off of the chute 21 onto the toe 33a of the transfer finger 33,

.-it is carried by the oscillating transfer arm 53 over to a position where the head of the blank will first ride on the finger 4| when the end of the pusher finger 4| pushes the blank off of said toe and then on both fingers 4|], 4|g into the slot'defined by said fingers with the shank of the blank abutting against the plate 4|h, and is thus started between the dies in accurate vertically and horizontally alined position. As the die 8- moves forward to perform the thread-rolling operation in conjunction with the stationary die 1, the blank gradually moves clear of the fingers I, Hg and is discharged in a manner to be described in conjunction with the general operation .of the machine.

The pusher slide 42 in the present instance is driven or reciprocated in synchronism with the transfer finger and other movable parts by means of the assembly particularly shown in Figs. -1, 2, -8 and 8a. A slide housing 45 is provided for the slide 42, and fixed to and projecting outwardly from this housing is a bracket 46 in which. is adjustably mounted an abutment or limit stop member 41 adaptedto contact the portion 42a of the slide 42 which carries the pusher fingers 4| and a. 'I'herear end of the slide connects by means of a pivoted link 48 with-a lever 49, which lever is fixed on the one end of a shaft 50, the latter having bearing in a boss formed on the adjacent frame of the machine. The opposite end of shaft 50 has mounted thereon in a particular manner to be described, a lever 52 which extends down and is provided with a cam roller 52a adapted to contact with a cam 53 mounted on the projection 54 of the main drive or crank shaft 54a.

Lever 52 is held fixed with respect to shaft 50 by means of an adjustable bracket 55,.note particularly Figs. 8 and 8a, which is provided with a pair of set screws 56 adapted to engage a block 51 positioned on a squared portion of shaft 50. Projecting from bracket 55 in line with lever 52 is a lever 58 terminating in a boss 58a which is bored and houses a safety assembly comprising a pin 59 having an enlarged head 59a adapted to engage a detent 5|] formed in lever 52 and a spring 8| which normally urges said head into seated position in said detent. The projecting end of the pin 58 has fixed thereon a knob 62 having formed therein a recess or shoulder adapted to lock in a corresponding recess or shoulder formed in the end of the housing 58a, as indicated at 63. By adjusting screws 55, the dwell of the cam 53 may be varied and consequently the dwell of the pusher fingers 4|, 4 la.

: The safety assembly just described acts as an automatic relief in the event the pusher mechanism should jam on its forward stroke. Also, by turning knob 52 and releasing the safety assembly In this instance, the lip 4|b on the The slide 42 is normally urged to its retracted 5 position with the portion 424 thereof abutting against the adjustable limit stop 41, by means of a compression spring 44 which is carried by a pin or like member 65 passed through an abutment lug or car 66 and pivotally connectedto a lever 41 It will be seen that by adjusting the limit'sto 41 the retracted position of the pusher fingers may be accurately gauged and adjusted. This is of considerable importance, since when the toe 33a of the transfer finger .83 engages under the head of a'blank and transfers the blank to the ends of the pusher fingers 4|, 4la the blank should have time to settle and steady itself before being thrust between the dies, to ensure true alinement of the threads. As soon as the pusher reaches the limit stop on its retraotive movement and the cam roller fla clears the cam 53, all further movement of the pusher fingers ceases until the cam again contacts the roller, and during this period the bolt blank is transferred to the end of the finger 4| and settles thereon. Also, by means of this adjustment structure the retracted position of the ends of the pusher fingers may be adjusted, not only while the maso chine is idle but also while in operation. This adjustment may be accurately made 'and thereby bring the ends of the pusher fingers to a position to receive a blank with its head resting squarely on the top of the finger 4| and its shank u flush against the end faces of both fingers 4|, lla, a position that crimes correct alinement with the threading dies. Thus, this adjustment ensures the most efilcient transfer action at all times and permits a high rate of production.

The adjustment 54, 51 for the lever 52 times the moment of advance of the pusher fingers inde pendently of the adjustment abutment 41. Thus the dwell of the pusher fingers may be varied within certain limits while the adjustment at 41 45 remains constant. There is thus no necessity to change the position of the thread-rolling dies when timing the thread-rolling operation. The foregoing adjustments may be made in conjunction with one another or separately, and advan- I0 tages other than those enumerated may be obtain'ed as willbe obvious to those skilled in the bolt making art.

Pivotally mounted on the die block 4 as at I is an ejector or kick-out member. 54,, which in 55 the form shown is provided with an arcuate cam portion 68a adapted to engage a cam roller 4| carried by a bracket "a, which is adjustably secured to the cap ll. The member 44 is formed with a projecting ejector finger b which eon- O0 tacts the threaded bolt blank at the termination of the thread-rolling operation ensures ejection of the blank. A compression spring "I: is anchored at one end to the die block 5 and at its opposite end is connected to the kick-out member 66 58, the spring being positioned so that it exerts an eccentric thrust relatively to the pivot 58' of the kick-out member. when the die I moves forward to roll a thread on a blank, the cam roller 69 clears the arcuate cam portion a until 10 the termination of the thread-rolling stroke, at

which time said roller contacts the extremity of said portion, throwing the compression spring 69b over the centerof the vertical axis of the pivot and causing a kick-out stroke of said u I heading dies or the like.

member 63. The said member then dwells until the return stroke of the die is substantially completed, to ensure clearance of finger 38b, whereupon'roller 39 contacts the opposite extremity of the cam portion 63a and returns the member 88' to its original position, or that shown in Fig. 1. By adjusting the bracket 69a laterally the dwell or timing of the kick-out member 63 may also be adjusted. It will be seen that this type of kickout device can be arranged, to give a hammerlike knock out stroke. a

While the blanks may be fed to the chute 21 manually or from a hopper or like means, I have shown a portion of a conveyor tube 10 in the present instance, which tube may lead to the discharge means of pointing mechanism,'such as is shown in my copending application Serial No. 639,054, hereinbefore referred to, or may receive blanks in any suitable way directly from the A brief description of the operation of the machine follows:

The tail slide 6 comprises part of a header slide which is reciprocated through the medium.

of a connecting rod, not shown, driven by the crank shaft 54a, for carrying out the heading or other operations as disclosed in my aforesaid prior application. The resultant reciprocation oftail slide 3 oscillates lever [B whichv in turn reciprocatesthe thread-rolling die 8 in the same direction as the slide 6. In the position as shown in Fig. 1, the die 3 is starting the thread-rolling operation. As the slide 6 and die 8 move further toward theleft, pusher cam 53 actuates lever 52 and moves the pusher fingers 4!, a forward,

driving the bolt blank in between the dies. Die

, 8, in conjunction with die I, then rolls a thread on the shank of the bolt as the tail slide 6 completes its rearward stroke.

At the completion ofthe thread-rolling operation, the kick-out member 68 is tripped by cam roller 69 and the kick-out finger 68?) contacts the head of the threaded blank and kicks it clear of the dies.

The thread-rolling or rearward movement of slide 6 brings transfer finger cam 40 into contact with cam roller 35 and moves transfer finger 33 back to bring the toe 33a thereof into blankreceiving position at the discharge end of the chute 27. It will be noted by observing Figures i and 51) that the blank-carrying toe 33a of transfer finger 33 is of such width that at no time is it clear-of the end of the chute except on,

its return stroke, and then Just enough to permit the shank of a blank to pass and bring the head -of the blank onto said toe. Thus the blanks are "prevented from falling out of the chute by toe 33a during the transfer operation. A position which will ensure proper gravity feed of the blanks can be obtained by adjusting the relative height and angle of inclination of chute 21.

As the toe 33a of transfer finger 33 moves back clearof the end'of the chute 21, a blank is suspended by its head on said toe. Slide 6 and reciprocating die 8 are now moving forward, or

finger 68b to clear the unthreaded blank, and

throws said member back to its original position.

It will be understood that important advantages other than those heretofore recited may be obtained by the use of the present improved mechanism, and that the specific constructions shown and described to obtain these advantages 5 are not to be construed in the nature of limitations, the scope of the invention being defined by the appended claims.

What is claimed is:

1. In a bolt making machine, a reciprocating l0 header slide, a thread-rolling die supported by. said slide and movable longitudinally with respect to' the slide, a cooperating thread-rolling die mounted adjacent" the slide, and means for reciprocating said first-named die through the medium of said slide.

2. In a bolt making machine, a reciprocating header slide, a thread-roiling die supported by said slide and movable longitudinally with respect to the latter, a coacting relatively stationary 2 thread-rolling die mounted adjacent the slide, and toggle mechanism including a lever having an intermediate fulcrum connection with the slide and a pivotal connection with said movable die for reciprocating the latter through the me- 2, diu'm of said slide.

3. In a bolt making machine, a reciprocating header slide, a thread-rolling die supported by said slide and movable longitudinally with respect to the slide, a coacting relatively stationary thread-rolling die mounted adjacent the slide and means having an operative connection with said slide and movable die for applying a substantially straight line driving action to the movable die for reciprocating the latter. 36

4. In a bolt making machine, a reciprocating header slide, a thread-rolling die supported for a relative longitudinal movement by said slide,

a coacting thread-rolling die mounted adjacent the slide, and toggle mechanism having an op- 4i erative connection with said slide and said movable die for reciprocating the latter, said toggle .mechanism including a main lever having a fulcrum connection with said slide and floating linkage connections at opposite extremities, respectively, with a relatively stationary part of the machine and said movable die for applying a substantially straight line driving action to the latter.

5. In a bolt making machine, a bed frame, a header slide mounted to reciprocate in said bed frame, said header slide being formed with a longitudinal recess in the side thereof, a die block mounted for longitudinal reciprocation in said recess, a die anchored to said block, a 00- acting die anchored to said bed frame in operative adjacency to said first-named die, and toggle mechanism including a lever which is fulcrumed to said slide and having a pivotal link connection at opposite ends, respectively, with 0 said fed frame and said die block.

6. In a bolt making machine, a bed frame, a header slide mounted to reciprocate in said frame, the opposite sides of said slide being formed with longitudinal bearing surfaces, a red5 ciprocating die assembly operatively associated with one side of the slide and comprising a die block, a thread-rolling die anchored in said block, and anti-friction bearings between said block and slide, a bearing assembly associated It} with the other side of said slide, a relatively stationary die mounted adjacent to said first-named die, and means for reciprocating said die block, said bearings taking the lateral thrust during the thread-rolling operation. {if

7. In a thread-rolling machine, a reciprocating die, a relatively stationary die, and means for adjusting said latter die laterally with. re-' die, a relatively stationary die, means for adjustframe, a reciprocating die, a relatively stationary ing said stationary die laterally and means for adjusting said stationary die with respect to said reciprocating die and also angularlywith respect to the plane defined by the longitudinal axes of said two dies, and means for operating said lidjusting means as a unit or individually to obtain a desired adjustment.

9. In a thread-rolling machine, a pair of rela- I tively reciprocable. dies, a holder for one of said dies, means for adjusting said one die comprising a pair of spaced wedge members engaging the rear face of said holder, said holder having concave recesses and each of said wedge members having a complementary convex face engaging in a one of said recesses.

10. A screw thread machine, a reciprocating die, a relatively stationary die, and means for adjusting said latter die substantially vertically, laterally with respect to said reciprocating die and also angularly with respect to the plane defined by the longitudinal axes of said two dies while maintaining the desired relative longitudinal alinement of the die faces.

11. In a screw threading machine, a bed having its delivery end positioned within proximity to the dies, a movable transfer member adapted to engage a blank by its head and hold the blank in bodily suspended position, means for moving the said member alternately to a posi tion to receive a blank from the delivery end of the chute and to a position whichwill bring the shank of the blank in thread-rolling alinement with said dies, and means for adjusting the posi-- tion of said member with respect to the dies to thereby vary the overall thread length of said shank.

13. In a screw thread machine, coacting thread-rolling dies, means for delivering headed blanks to said dies including a pusher member adapted to engage the shank of successive blanks and exert pressure thereon at the initial stage of the thread forming operation, said "pusher member comprising a head contacting member and a shank contacting member and means for adjusting the shank-contacting member of the pusher member to accommodate varying lengths of shanks.

as a unit, and means for adjusting the upper finger independently of the lower finger.

15. In a screw thread machine, coacting thread-rolling dies, a p er finger adapted to engage and push a blank between said dies at l the initial stage of the thread-rolling operation,

a cam for advancing said finger with respect to said dies, and yielding means for retracting said finger, an adjustable limit stop for determining the retracted position of said finger, and means 10 for timing the moment of advance of said finger.

16. In a screw thread machine, a stationary thread-rolling die and a coacting reciprocating thread-rolling die, means foridelivcring headed blanks to said dies, and a combined blank-supll porting and abutment device associated with the reciprocating die adapted to engage under the head of a blank on two sides of the blank at'the initial stage of the thread-rolling operation and support the blank in true horizontal thread-roll- I! ing alinement.

17. In a screw thread machine, coacting threadrolling dies, means for delivering headed blanks to said dies, and an adjustable blank alining and supporting device formed with a slotted portion '6 adapted to engage under the head of eachblank as it is delivered to the dies and support the blank in true horizontal thread-rolling alinement, said device also serving as an abutment for the shank of the blank whereby the latter is 80 alined vertically with respect to the dies.

18. In a bolt making machine, a bed frame, a header slide mounted to reciprocate in said frame. a reciprocating thread-rolling die associated with one side of said slide, anti-friction bearings as- 88 sociated with the opposite side of said slide and adapted to take the lateral thrust exerted on the slide during the thread-rolling operation, and bearings associated with the thread-die side 0! the slide adapted to preload the first-named bear- 0 ing and compensate for spring movement of the slide during the thread-rolling operation and avoid possible mutilation of the threaded shanks of bolt blanks when the latter clear the dies.

tudinal movement by said slide, a coaeting rela- 66 tively stationary thread-rolling die mounted adjacent the slide, and means for reciprocating said movable die comprising a main lever fuicrumed to said slide, a link pivoted at one end to said lever and at its opposite end having an operative pivotal connection with said die, and another link for pivotally anchoring the opposite end of said lever to a part of the machine which is stationary with respect to said slide.

21. In combination, a bed frame, a slide mounted to reciprocate in said frame, a die block supported for relative longitudinal reciprocation by said slide, a thread-rolling die in said block, a coactlng thread-rolling die mounted adjacent to 70 said first-named die, antifriction bearings interposed between said block and said slide for taking the lateral thrust during the thread-rolling operation, means for reciprocating said slide, and means for simultaneously reciprocating saiddie block with respect to, and in the same direction as, said slide.

22. In a thread rolling machine, a reciprocating die, a relatively stationary die and a support therefor, co-operating wedge members interposed between the stationary die and its support for adjusting the die laterally and at an incline with respect to the reciprocating die, and means for adjusting said wedge members singly or as a unit to obtain a desired adjustment.

23. In a thread rolling machine, a pair of relatively reciprocable dies having spaced substantially plane and parallel coacting die faces, means for adjusting one of said dies to move said faces toward or away from each other, and means for adjusting one of said dies to tilt the face thereof with respect to the face of the other die about a substantially horizontal axis, without affecting the alignment of said two faces with each other longitudinally.

24. In a thread rolling machine, a reciprocating die, a relatively stationary die, and coacting wedge members for adjusting said stationary die laterally, said wedge members being adapted to adjust said die at a slight inclination with respect to the reciprocating die, said wedge members being formed with convex faces in transverse section to facilitate adjustment.

25. In a thread rolling machine, coacting threading dies, and delivery mechanism for said dies comprising a chute adapted to convey headed blanks to a point adjacent said dies, a movable transfer member adapted to receive a blank from the delivery end of said chute and transfer the blank to an initial starting position between said dies, said member being formed to engage under the head of a blank and suspend the blank bodily during the transfer operation, and means for adjusting said member to thereby adjust the starting position of said blank with respect to said dies.

26. In a thread rolling machine, coacting thread-rolling dies, means for delivering headed blanks to said dies including a delivery chute,

a transfer member adapted to transfer blanks from said chute into a position which will bring the shanks of the blanks in thread-rolling alignment with said dies, and means for adjusting the transfer member and chute substantially vertically to determine the length of thread to be formed on the shank of the blank.

27. In a thread rolling machine, coacting thread-rolling dies, 'means for delivering headed blanks to said dies including a delivery chute, and a transfer member adapted to receive blanks from said chute and transfer them bodily into thread-rolling alignment with said dies, a pusher member adapted to engage and push the blanks from said finger to an initial starting position between said dies, and means for adjusting the transfer member and pusher member substan- 1o tially vertically to determine the length of the portion of the,shank which is to be threaded by said dies.

28. In combination, a bed frame, a slide, a thread-rolling die mounted on said frame and a coacting reciprocating die mounted on said slide, means for delivering headed blanks to said dies including an oscillating transfer member and a pusher member, means for reciprocating said second-named die and oscillating said transfer member, and means for actuating said pusher member.

29. In a bolt making machine, a bed frame, a slide carrying a thread rolling die, mounted to reciprocate in said frame, a second thread rolling die opposite said reciprocating die, anti-friction bearings between the bearing surface of said slide .and said frame, and a pressure exerting bearing means pressing against said slide to hold the anti-friction bearings under constant pressure. 1

30. In a bolt making machine, a frame, a reciprocating header slide, a thread rolling die supported for relative longitudinal movement by said slide and a co-acting relatively stationary thread-rolling die, means for reciprocating said slide on said frame and means for reciprocating said reciprocable die on said header slide, said means having an operative connection with said slide and reciprocable die for reciprocating the latter.

31. In a thread rolling machine, a pair of coacting thread rolling dies, an abutment means mounted adjacent one of said dies fixed with respect thereto and projecting into the path of a bolt blank between said dies, means to urge a bolt blank into said path and into engagement with said abutment, said two means co-operating to grip and vertically align said bolt blank in 0 thread rolling position.

EARL R. FROST. 

